Submission #245790

#	Time	Username	Problem	Language	Result	Execution time	Memory
245790		Nightlight	Safety (NOI18_safety)	C++14	100 / 100	68 ms	5636 KiB

safety

#include <bits/stdc++.h>
using namespace std;

int N;
long long A[100005];
long long ans;
priority_queue<long long, vector<long long>> L;
priority_queue<long long, vector<long long>, greater<long long>> R;
long long H, now, SL, SR;

int main() {
  ios_base::sync_with_stdio(0);
  cin >> N >> H;
  cin >> now;
  L.push(now);
  R.push(now);
  for(int i = 2; i <= N; i++) {
    cin >> now;
    SL += H;//shift kiri dan kanan by H
    SR -= H;
    long long Lnow = L.top() - SL;
    long long Rnow = R.top() - SR;
//    cout << Lnow << " " << Rnow << "\n";
    if(now < Lnow) {
      L.pop();//buang dari kiri masukin ke kanan
      R.push(Lnow + SR);
      L.push(now + SL);
      L.push(now + SL);
      ans += abs(now - Lnow);
    }else if(now > Rnow) {
      R.pop();
      L.push(Rnow + SL);
      R.push(now + SR);
      R.push(now + SR);
      ans += abs(now - Rnow);
    }else {
      L.push(now + SL);
      R.push(now + SR);
    }
  }
  cout << ans << "\n";
  cin >> N;
}

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29